From: Miao Xie <[email protected]> btrfs_find_create_tree_block() may return NULL, so we must check the returned value, or we will access a NULL pointer.
Signed-off-by: Miao Xie <[email protected]> --- fs/btrfs/extent-tree.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 1727b26..503a18e 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5205,6 +5205,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans, next = btrfs_find_tree_block(root, bytenr, blocksize); if (!next) { next = btrfs_find_create_tree_block(root, bytenr, blocksize); + if (!next) + return -ENOMEM; reada = 1; } btrfs_tree_lock(next); @@ -5417,7 +5419,8 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans, if (ret > 0) { path->slots[level]++; continue; - } + } else if (ret < 0) + return ret; level = wc->level; } return 0; -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
